I love Rdio. All the music I want to hear (that happens to be available in their library) for $10 a month. It gets better. I can download the songs to the mobile Rdio apps for offline listening. Even better still, there's an Rdio API and it's pretty rich, as described by Rdio's Ian McKellar in the video below.

The Google Firebase APP Indexing API supports the introduction and visibility of apps in Google Search. It allows Google to index app content for purposes of exposing it in Search results. Users can...